From: Eric Christopherson <echristopherson@...>
Date: 2010-07-30T08:03:05+09:00
Subject: Re: Problem with a lambda not executing immediately

On Thu, Jul 29, 2010 at 3:38 PM, Fernando Perez <pedrolito@lavache.com> wrote:
> Hi,
>
> I'm using the paperclip plugin for one of my rails app, but my problem
> is pure Ruby. I'm not good enough with Ruby and lambdas so I need your
> advice.
>
> Here is the code I am trying to make work:
>
> class Asset < ActiveRecord::Base
>
>  has_attached_file :data, :styles => {
>    :theora => [:format => :ogv, :processors => lambda {|a| a.video? ?
> [:video_converter] : []}}]
> }
>
> end

You have an extra } before ]. I'm assuming that wasn't part of your
actual script, because then you'd get a syntax error.

>
>
> What fails is the lambda, because in Paperclip behind the scenes this is
> what happens:
>
> @var = style.processors.inject(something) do |file, processor|
> ...
> end
>
> style.processors has received the lambda defined earlier.
>
>
> And I get the following error message:
>
> NoMethodError (undefined method `inject' for #<Proc:0x455d864>)

It looks like style.processors is itself a proc instead of an
enumerable. Try to find where it was assigned and make sure you pass
the proc inside of an array.